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Document --size-hint

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Nick Magerko
2019-08-20 14:08:26 -07:00
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@@ -144,6 +144,13 @@ the last one takes effect.
Due to the chaotic nature of dynamic adaptation, compressed result is not reproducible. Due to the chaotic nature of dynamic adaptation, compressed result is not reproducible.
_note_ : at the time of this writing, `--adapt` can remain stuck at low speed _note_ : at the time of this writing, `--adapt` can remain stuck at low speed
when combined with multiple worker threads (>=2). when combined with multiple worker threads (>=2).
* `--size-hint=#`:
When handling input from a stream, `zstd` must guess how large the source size
will be when optimizing compression parameters. If the stream size is relatively
small, this guess may be a poor one, resulting in a higher compression ratio than
expected. This feature allows for controlling the guess when needed.
Exact guesses result in better compression ratios. Overestimates result in slightly
degraded compression ratios, while underestimates may result in significant degradation.
* `--rsyncable` : * `--rsyncable` :
`zstd` will periodically synchronize the compression state to make the `zstd` will periodically synchronize the compression state to make the
compressed file more rsync-friendly. There is a negligible impact to compressed file more rsync-friendly. There is a negligible impact to